^

# The calculator and powers of seven (5th grade math)

In this example, we find which exact power of seven is more than one million, using a calculator. This is a simple exercise helping students to learn to use the calculator.

Once you punch 7 × 7 = with a calculator, and get 49, you can just keep pushing the equals button, which will multiply your previous result by 7. And thus, you can get a sequence of numbers that are powers of 7: 7 to the third power (or 73, 7 to the fourth power (or 74), 7 to the fifth power (exponent is 5) and so on.

The connection between multiplication and division, simple equations, bar models, terminology

More problem solving with bar models, part 1

Back to 5th grade videos index

Back to the index of all videos

WAIT!

Receive my monthly collection of math tips & resources directly in your inbox — and get a FREE Math Mammoth book!

You can unsubscribe at any time.

### Math Mammoth Tour

Confused about the different options? Take a virtual email tour around Math Mammoth! You'll receive:

An initial email to download your GIFT of over 400 free worksheets and sample pages from my books. Six other "TOURSTOP" emails that explain the important things and commonly asked questions concerning Math Mammoth curriculum. (Find out the differences between all these different-colored series!)

This way, you'll have time to digest the information over one or two weeks, plus an opportunity to ask me personally about the curriculum.
A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time)

### "Mini" Math Teaching Course

This is a little "virtual" 2-week course, where you will receive emails on important topics on teaching math, including:

- How to help a student who is behind
- Troubles with word problems
- Teaching multiplication tables
- Why fractions are so difficult
- The value of mistakes
- Should you use timed tests
- And more!

A GIFT of over 400 free worksheets and sample pages from my books right in the very beginning. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time)